User’s Manual U11969EJ3V0UM00
205
CHAPTER 8 SERIAL INTERFACE FUNCTION
8.1 Features
The V854 is provided with three types of serial interfaces which operate as 6-channel transmission/reception
channels. Four channels can be used simultaneously.
There are the following three types of interfaces.
(1) Asynchronous serial interface (UART) : 1 channel
(2) Clocked serial interface (CSI)
: 4 channels
(3) I
2
C bus interface (I
2
C)
: 1 channel (
µ
PD703008Y and 70F3008Y only)
The UART transmits/receives 1-byte serial data following a start bit and can perform full-duplex communication.
The CSI uses three signal lines to high-speed synchronous data transfers data (3-wire serial I/O): serial clock
(SCKn), serial input (SIn), and serial output (SOn) lines.
The I
2
C uses two signal lines, which are serial clock (SCL) and serial data bus (SDA), to transfer data (
µ
PD703008Y
and 70F3008Y only).
Caution
UART and CSI0, and CSI1 and I
2
C share the same pin respectively. Either one of these is selected
according to ASIM0 and ASIM1.
Summary of Contents for V854 UPD703006
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